Exhaust silencer



EXHAUST S ILENCER Filed July 7. 1930 Patented May 5,. 1931 UNITED STATES PATENT OFFICE.

JOHN EDWARD SYKES, OF HABEHILLS, LEEDS, ENGLAND EXHAUST SILENCER Application filed July 7, 1930, Serial No. 466,235, and in Great Britain April 16, 1929.

This invention relates to exhaust silencers for internal combustion engines, the chief object being to provide a new or improved exhaust silencer whereby the use of the ordi- '51 nary expansion chamber on petrol driven motor vehicles will be obvlateo.

According to the invention, the exhaust silencer comprises a pipe embodying a series of bafile plates and adapted to be connected at one end to the exhaust manifold of the engine, the other end of said pipe leading into an enlarged oyster-shaped receptacle or chamber having a restricted outlet and.

adapted to allow of a sudden expansion of the gases on leaving the pipe and prior to assmg out by way of said restricted outlet.

1 he inlet end of the pipe may be connected to the exhaust manifold of the engine either directly or through the medium of a flexible or other metal tube, and the baflle plates are preferably arranged in stag ered formation from opposite sides of the p1pe and inclined relatively tothe axis thereof with their inner or leading edges directed toward the outlet end'so as to cause the exhaust gases to take a sinuous or zig-zag course through said pipe to the oyster-shaped receptacle or outlet chamher, while the outlet from the latter is preferably in the form of a narrow slit afforded at the rear edge of the flattened and widest portion of said oyster-shaped receptacle or outlet chamber. The employment of the oyster-shaped outlet chamber or receptacle in conjunction with the bafiied pipe obviates back pressure and ensures efiicient silencing.

In order that the invention may be clearly understood and readily carried into effect, the same will now be more fully described with reference to and by the aid of the accompanying drawings; wherein 2-- Figures 1, 2 and 3 are respectively a side elevation and a plan view in which the pipe is partly broken away for the sake of clearness, and an end elevation of an exhaust silencer constructed according to the invention.

Referring to the drawings, the exhaust silencer com rises a pipe 1, embod ing a series of bald; plates 2 and adapte to be 50 connected at one end to the exhaust manifold of the engine, the other end of said pipe 1 leading into an oyster shaped receptacle or v outlet chamber 3. Said receptacle 3 is made separate from the pipe 1 and is formed with a neck 4: into which the pipe 1 is inserted. 5 The pipe 1 may be a tight fit in the neck 4 or the latter may be slit so as to give when the pipe is forced in and so that it can then be t1 htened by means of a collar 5 and nut and olt 6, and in this connection the nut and bolt 6 may also pass through a bracket (not shown) so as to support the silencer on the vehicle chassis. The pipe 1 is pro-- vided with a number of inclined baflles 2 arranged in staggered formation from opposite 05 sides and with their inner or leading edges directed toward the outlet end so as to cause the exhaust gases to take a sinuous course through said pipe 1. The bafiles 2 are preferably separately formed and passed through slits in the pipes so that they can be welded or otherwise suitably secured thereto. The

'rear edge of the oyster shaped receptacle or outlet chamber 3 is flattened and prevented from being forced outwardly by strengthening bars 7 and holding bolts 8 passed therethrough. Thus the shape of the receptacle or outlet chamber 3 is such as to allow of a sudden expansion of the gases, whilst affording a restricted outlet.

I am aware it has before been proposed in exhaust silencers embodying a box or pipe leading directly -.into a restricted or fishtail outlet to provide baflies in the box or pipe, said baffles being in the form of plates arranged in staggered formation from opposite sides and inclined toward the outlet.

I claim An exhaust silencer comprising a pipe adapted to be connected at one end to the exhaust manifold of an engine, an enlarged substantially oyster-shaped receptacle connected to the opposite end of the pipe, said pipe having a series of staggered baflie plates disposed alternately on opposite sides there of and inclined relative to the axis of the pipe, said baffles having their inner or leading edges directed toward the outlet so as to cause the exhaust gases to take a sinuous course through the pipe, said receptacle hav- 1?;

movement thereof.

JOHN EDWARD SYKES. 

